Researchers are studying the difference between two types of dental expanders: the Invisalign Palatal Expander and the Hyrax Expander. These devices help widen the upper jaw, also known as the maxilla. In this study, kids ages 6 to 11 who need their upper jaw expanded can participate. It's important that they have certain teeth, like the primary molars or permanent premolars, already in place.

Some kids cannot join the study if they have problems like a cleft palate, which is an opening or gap in the roof of the mouth. Kids won't be able to participate if they have allergies to the materials used in the devices or if they have tooth decay, gum disease, or other dental issues.

• The study will compare how well each expander works and how kids feel using them.
• Participants must attend regular dental visits during the study.
• There might be some risks like discomfort from wearing the expanders.